02-02-2010
The timestamps are supposed to reflect operations to a file. If I have a globally writable file I can notice when it changes because the timestamp will change. So I allow changes to my file provided that I can detect the changes. If you can change the timestamp you can alter the file and then back date the timestamp to conceal the change from me. Ideally, a new bit in addition to the rwx bits might allow me to give others a timestamp permission on a file... but that would be expensive.
It's harder to justify why the owner must also have write permission on the file. Maybe the idea is that if the owner has removed write permission from himself he must want to prevent any unintended changes to the file.
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touch(1B) SunOS/BSD Compatibility Package Commands touch(1B)
NAME
touch - change file access and modification times
SYNOPSIS
/usr/ucb/touch [-acfm] file...
DESCRIPTION
touch sets the access and modification times of each file to the current time. file is created if it does not already exist.
OPTIONS
-a Change the access time of file. Do not change the modification time unless -m is also specified.
-c Do not create file if it does not exist.
-f Attempt to force the touch in spite of read and write permissions on file.
-m Change the modification time of file. Do not change the access time unless -a is also specified.
USAGE
See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
EXIT STATUS
The following exit values are returned:
0 touch executed successfully and all requested changes were made.
>0 An error occurred. touch returns the number of files for which the times could not be successfully modified.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
touch(1), attributes(5), largefile(5)
SunOS 5.10 26 Oct 1995 touch(1B)